In my experience, just run that all against the same worker and the hash rate from all of them will apply.
This is true. Tested on ppcoin.d7.lt and on btcguild. All blades have same worker name and password and the share rate is applyed.
Now can anyone explain how to setup failover pool in proxy??
I found this link
https://en.bitcoin.it/wiki/Bitcoin-mining-proxy but it is to complicated to me.
Thanks